summaryrefslogtreecommitdiffstats
path: root/mm/memory_hotplug.c
diff options
context:
space:
mode:
Diffstat (limited to 'mm/memory_hotplug.c')
-rw-r--r--mm/memory_hotplug.c32
1 files changed, 22 insertions, 10 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index bb30e99b7383..1b40eebae3e4 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -813,7 +813,7 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages,
/* associate pfn range with the zone */
zone = zone_for_pfn_range(online_type, nid, pfn, nr_pages);
- move_pfn_range_to_zone(zone, pfn, nr_pages, NULL, MIGRATE_MOVABLE);
+ move_pfn_range_to_zone(zone, pfn, nr_pages, NULL, MIGRATE_ISOLATE);
arg.start_pfn = pfn;
arg.nr_pages = nr_pages;
@@ -825,6 +825,14 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages,
goto failed_addition;
/*
+ * Fixup the number of isolated pageblocks before marking the sections
+ * onlining, such that undo_isolate_page_range() works correctly.
+ */
+ spin_lock_irqsave(&zone->lock, flags);
+ zone->nr_isolate_pageblock += nr_pages / pageblock_nr_pages;
+ spin_unlock_irqrestore(&zone->lock, flags);
+
+ /*
* If this zone is not populated, then it is not in zonelist.
* This means the page allocator ignores this zone.
* So, zonelist must be updated after online.
@@ -841,21 +849,25 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages,
zone->zone_pgdat->node_present_pages += nr_pages;
pgdat_resize_unlock(zone->zone_pgdat, &flags);
+ node_states_set_node(nid, &arg);
+ if (need_zonelists_rebuild)
+ build_all_zonelists(NULL);
+ zone_pcp_update(zone);
+
+ /* Basic onlining is complete, allow allocation of onlined pages. */
+ undo_isolate_page_range(pfn, pfn + nr_pages, MIGRATE_MOVABLE);
+
/*
* When exposing larger, physically contiguous memory areas to the
* buddy, shuffling in the buddy (when freeing onlined pages, putting
* them either to the head or the tail of the freelist) is only helpful
* for maintaining the shuffle, but not for creating the initial
* shuffle. Shuffle the whole zone to make sure the just onlined pages
- * are properly distributed across the whole freelist.
+ * are properly distributed across the whole freelist. Make sure to
+ * shuffle once pageblocks are no longer isolated.
*/
shuffle_zone(zone);
- node_states_set_node(nid, &arg);
- if (need_zonelists_rebuild)
- build_all_zonelists(NULL);
- zone_pcp_update(zone);
-
init_per_zone_wmark_min();
kswapd_run(nid);
@@ -1577,9 +1589,9 @@ int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages)
pr_info("Offlined Pages %ld\n", nr_pages);
/*
- * Onlining will reset pagetype flags and makes migrate type
- * MOVABLE, so just need to decrease the number of isolated
- * pageblocks zone counter here.
+ * The memory sections are marked offline, and the pageblock flags
+ * effectively stale; nobody should be touching them. Fixup the number
+ * of isolated pageblocks, memory onlining will properly revert this.
*/
spin_lock_irqsave(&zone->lock, flags);
zone->nr_isolate_pageblock -= nr_pages / pageblock_nr_pages;